<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
		<title></title>
		<style type="text/css">
			*{
				padding: 0;
				margin: 0;
			}
			#box{
				width: 800px;
				height: 300px;
				border: 3px solid red;
				background: blue;
				/*居中*/
				margin: 0 auto;
			}
		</style>
	</head>
	<body>
		<div id="box"></div>
	</body>
</html>
